It is found that a close approximation to uniformity of magnetic flux along a test rod can be secured by using properly constructed specimens and yokes and properly distributed magnetising coils. The double bar and yoke form of magnetic circuit seems to offer the greatest number of advantages and the fewest disadvantages. The reluctance of the yoke and joints can be kept very small. This is accomplished by having the yokes short and of moderately large cross-section, and making the surface of contact between specimens and yoke of considerable area; the corners of the yokes should be rounded off so as to avoid, as far as possible, disturbing end effects.

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